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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5c6e6f530bf5be221e0bb528812789beaac97e3049ae0a00d8ddf181a2701a5' 
  AND token = 'pd75QzR6vOthjJyEs1vLHAY8mCx/t8gbP8EmdDQLk9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}